Motorola SSETM 5000 - Manual (Page 74)

November 11, 2004 6881094C12-A
5-4 Radio Alignment Procedures: Transmitter Alignments
NOTE: Reference oscillator alignment is required after replacing (or servicing) the transceiver board.
To align the reference oscillator:
1. Select the Reference Oscillator alignment screen. See Figure 5-5 .
Figure 5-5. Reference Oscillator Alignment Screen
2. Left-click the PTT Toggle button on the screen to make the radio transmit. The screen
indicates whether the radio is transmitting.
3. Measure the transmit RF frequency with your communications system analyzer.
4. Adjust the reference oscillator’s softpot value until the measured value is as close as possible
to the frequency shown on the screen. See Table 5-1 .
5. Left-click the Program All button on the screen to dekey the radio and save the tuned values.
6. Left-click the Close button on the screen to return to the Transmitter Alignments menu.
5.5.3 Transmit Power Alignment
This alignment procedure adjusts the transmit power of the radio and must be performed for two
different power levels (Low and High), at multiple frequencies for each power level, to allow for
proper alignment across the entire RF band. (The mid-power level is available to be tuned, but it
cannot be used.) The RF band is divided into frequency zones with a calibration point (value) in each
zone.
NOTES:
• The same softpot attenuation value will result in different radio output power levels at different
frequencies.
• All power measurements are to be made at the antenna port.
• Transmit Power alignment is required after replacing (or servicing) the transceiver board.
Table 5-1. Reference Oscillator Alignment
Band Target
UHF R2 (450–488 MHz) ±100 Hz